Outline Lecture 18

Outline Lecture 18 - Outline Lecture 18 Animal diversity 1....

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Outline Lecture 18 Animal diversity 1. Traits of all animals a. Heterotrophic, Multicellular, Lack Cell Walls, Motile, Sexual Reproduction, Embryonic development, specialized tissue 2. The animal body plan evolves through five key transitions 3. The old (morphology based) animal tree- Symmetry then Stomes finally body cavity 4. The new (DNA based) animal tree – Symmetry then stomes finally growth pattern The basal animals 1. Non-symmetric and radially symmetric animals A. Porifera- Sponges no tissue, very loose body organization, larvae are free swimming, highly specialized cells Cnidarians- has tissue, 2 body forms (Polyps and Medusae) Ctenophora- Small group radial symmetry with tissue 2. Bilaterians a. Arrow worms- Outside normal bilaterian group b. Lophotrochozoans: Part 1 (Pretty much, worms) i. Ectoprocts- tissue provides nutrition, asexual reproduction through fission, colonial marine organism ii. Platyhelminthes- have a true head( cephalization) acolomate Incomplete digestion, hermaphradite
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Outline Lecture 18 - Outline Lecture 18 Animal diversity 1....

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